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Re: I need to use/borrow a good bore guage]

To: Larry Colen <>
Subject: Re: I need to use/borrow a good bore guage]
From: Jim Juhas <>
Date: Fri, 25 Aug 2006 22:14:17 -0400
I'll weigh in on the question of clearance.  I think "tolerance" is the 
wrong word here.

The shop that did the bearing work on my 5.0L ford engine for my Cobra 
replica selected bearings individually for each journal to give me 
greater clearance than the middle or low end of the tolerance range, his 
premise being that an engine being pushed harder develops more heat and 
should have proportionally greater clearance at cold.  He builds lots of 
race engines.

Larry Colen wrote:

>When Armando did my crank, he machined the rod journals to tighter
>than stock tolerance, and told me to use thinner oil. The premise
>being that with the blower, the tighter tolerances will allow less
>room for the rods to pound on the crank.

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